Hi Mel, Thanks for reporting it. On 04/02/2013 10:27 PM, Mel Gorman wrote: > I'm testing a page-reclaim-related series on my laptop that is partially > aimed at fixing long stalls when doing metadata-intensive operations on > low memory such as a git checkout. I've been running 3.9-rc2 with the > series applied but found that the interactive performance was awful even > when there was plenty of free memory. > > I activated a monitor from mmtests that logs when a process is stuck for > a long time in D state and found that there are a lot of stalls in ext4. > The report first states that processes have been stalled for a total of > 6498 seconds on IO which seems like a lot. Here is a breakdown of the > recorded events. In this merge window, we add a status tree as a extent cache. Meanwhile a es_cache shrinker is registered to try to reclaim from this cache when we are under a high memory pressure. So I suspect that the root cause is this shrinker. Could you please tell me how to reproduce this problem? If I understand correctly, I can run mmtest to reproduce this problem, right? Thanks, - Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
